﻿PLATE XL 



Fig. 

 L Triffonia Pellati, Mun. Chal. Kimmeridge Clay, near St. Ives. (Page 4L) 



2. ,, formosa. Lye. Inferior Oolite, Rodborough Hill, near Stroud ; specimen 



with the costse deformed. (Page 35.) 



3. „ perlata, Ag. Coral Rag, Pickering ; specimen with the pallial portions of 



the costse irregular. (Page 22.) 



4. 5. „ dytia, D'Orb. Great Oolite, Box near Bath. (Page 76.) 



6, 7. „ ,, Impressions of small Trigoniae, proljably young examples of T. 



v.-costata, CoUyweston Slate. (Page 66.) 



8. ,, paucicosta, Lye. Kelloway Rock, Cayton Bay, near Scarborough. 



(Page 57.) 



9. „ „ Young example of the same species, from the same locahty and 



foianation. 



